... RF,DC5V,2AUX OUT 4.wireless,bluetooth 2.4G audio transmitter receiver Specification: frequency response45Hz-20KHzusing frequency2402-2480MHzsensitivity89dB±2dBaudio ... USB charging.5. Application: various multimedia room, Multi-function Room, classroom and conference room.6. Selectable wireless MIC:1090, 1060bluetooth audio transmitter ... ,Thanks a lot! 2.4GHz bluetooth audio transmitter receiver